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The U.S. Treasury offers various types of bonds and securities. Bond series are categorized by letters, such as Series EE and Series I, based on the year in which the bonds were issued and the denominations in which they are available, according to TreasuryDirect. Some bonds accrue interest which is paid out to the owner every six months. U.S. government bonds can be redeemed upon maturity at most financial institutions or through TreasuryDirect.